DIFFERENTIAL VOLTAGE MEASURING DEVICE

• US 20180164373A1
• Filed: 10/12/2017
• Published: 06/14/2018
• Est. Priority Date: 12/09/2016
• Status: Active Grant

• Current Assignee: Yazaki Corporation
• Original Assignee: Yazaki Corporation
• Inventors: WANG, Jian, FUJII, Hironao
• Granted Patent: US 10,838,005 B2
• Time in Patent Office: Days
• CPC Class Codes: G01R 19/10 Measuring sum, difference or ratio
• CPC Class Codes: G01R 19/16542 for batteries charge condition monitoring in G01R31/36
• CPC Class Codes: G01R 31/31706 involving differential digital signals, e.g. testing differential signal circuits, using differential signals for testing
• CPC Class Codes: G01R 31/378 specially adapted for the type of battery or accumulator
• CPC Class Codes: G01R 31/389 Measuring internal impedance, internal conductance or related variables
• CPC Class Codes: G01R 31/396 Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
• CPC Class Codes: H01M 10/4264 with capacitors
• CPC Class Codes: H01M 10/48 Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569
• CPC Class Codes: H01M 2010/4271 Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
• CPC Class Codes: H01M 2220/20 Batteries in motive systems, e.g. vehicle, ship, plane
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A differential voltage measuring device includes a first capacitor and a second capacitor each formed of a ceramic capacitor, a differential amplifier for outputting a voltage corresponding to a difference voltage between a voltage held by the first capacitor and a voltage held by the second capacitor, and μCOM for introducing a first voltage to the first capacitor, and a second voltage to the second capacitor with the first capacitor holding the first voltage, and μCOM introduces a third voltage to at least the first capacitor or the second capacitor, and after application of the third voltage stops, introduces the first voltage to the first capacitor or the second capacitor to which the third voltage was introduced.

Claims

1. A difference voltage measuring device comprising:

a first capacitor and a second capacitor, each formed of a ceramic capacitor;

a differential amplifier for outputting a voltage corresponding to a difference voltage between a voltage held by the first capacitor and a voltage held by the second capacitor, and

a control unit for introducing a first voltage to the first capacitor, and a second voltage to the second capacitor with the first capacitor holding the first voltage, wherein

the control unit introduces a third voltage to at least the first capacitor and after application of the third voltage stops, introduces the first voltage to the first capacitor to which the third voltage was introduced.

2. The difference voltage measuring device according to claim 1, wherein

the second capacitor has a smaller capacity than that of the first capacitor.

3. The difference voltage measuring device according to claim 1, wherein

the control unit controls a switch exclusively switching a connection destination of an input terminal to which voltage is applied to either the first capacitor or the second capacitor, so as to introduce the first voltage or the third voltage to the first capacitor, and with the first capacitor holding the first voltage or the third voltage, and introduce the second voltage or the third voltage to the second capacitor.

4. The difference voltage measuring device according to claim 2, wherein

the control unit controls a switch exclusively switching a connection destination of an input terminal to which voltage is applied to either the first capacitor or the second capacitor, so as to introduce the first voltage or the third voltage to the first capacitor, and with the first capacitor holding the first voltage or the third voltage, and introduce the second voltage or the third voltage to the second capacitor.

5. The difference voltage measuring device according to claim 1, further comprising

a current output unit switching to output, a first current supplied to generate the first voltage, a second current supplied to generate the second voltage, and a third current supplied to generate the third voltage.

6. The difference voltage measuring device according to claim 2, further comprising

a current output unit switching to output, a first current supplied to generate the first voltage, a second current supplied to generate the second voltage, and a third current supplied to generate the third voltage.

7. The difference voltage measuring device according to claim 3, further comprising

a current output unit switching to output, a first current supplied to generate the first voltage, a second current supplied to generate the second voltage, and a third current supplied to generate the third voltage.

8. The difference voltage measuring device according to claim 4, further comprising

a current output unit switching to output, a first current supplied to generate the first voltage, a second current supplied to generate the second voltage, and a third current supplied to generate the third voltage.